The Papacy was there from the beginning, my friend, you're making things up. Constantine legalized the Catholic Faith helping it spread. You apparently think that Christ has not the power to keep his Church true to his teachings which makes him a mere man and not God. Do you actually think Christ would establish a Church without a leader. What has actually morphed from the Catholic Church is the uncountable denominations claiming the guidance of the Holy Spirit who apparently can't keep them all believing the same thing. There is ONE Faith, ONE Baptism.
You apparently think that Christ has not the power to keep his Church true to his teachings which makes him a mere man and not God.
Who believes he is not God? Certainly not the true Church, certainly not me. I am not an Arian. Though I am not Trinitarian, I automatically side with Trinitarians - the non-RCC kind - over against the Arians, and any and all who deny Christ's deity.